fixed #890

1 files changed, 3 insertions, 3 deletions

diff --git a/framework/I18N/core/CultureInfo.php b/framework/I18N/core/CultureInfo.php
index 41b3bf45..31404a23 100644
--- a/framework/I18N/core/CultureInfo.php
+++ b/framework/I18N/core/CultureInfo.php
@@ -375,7 +375,7 @@ class CultureInfo
 	 */

 	function getDateTimeFormat()

 	{

-		if(is_null($this->dateTimeFormat))

+		if($this->dateTimeFormat === null)

 		{

 			$calendar = $this->getCalendar();

 			$info = $this->findInfo("calendar/{$calendar}", true);

@@ -455,7 +455,7 @@ class CultureInfo
 	static function getInvariantCulture()

 	{

 		static $invariant;

-		if(is_null($invariant))

+		if($invariant === null)

 			$invariant = new CultureInfo();

 		return $invariant;

 	}

@@ -478,7 +478,7 @@ class CultureInfo
 	 */

 	function getNumberFormat()

 	{

-		if(is_null($this->numberFormat))

+		if($this->numberFormat === null)

 		{

 			$elements = $this->findInfo('NumberElements');

 			$patterns = $this->findInfo('NumberPatterns');